224 CEPHALOPODS. 



Nautilus occidentalis SWALLOW. 



Nautilus occidentalis Swallow, 1858: Trans. St. Louis Acad. Sci., vol. I, 



p. 196. 



Nautilus quadrangularis McChesney, 1860: Desc. New Pal. FOSP., p. 65. 

 Nautilus nodocarinatus McChesney, 1860: Desc. New Pal. FOBS., p. 66. 

 Nautilus biserialis Hall, 1860: Geology Iowa, vol. I, Supp., p. 92. 

 Nautilus occidentalis McChesney, 1867: Trans. Chicago Acad. Sci., vol. I, 



p. 37. 

 Nautilus occidentalis Xeyes, 1888 : Proc. Acad. Nat. Sci., Phila., p. 342. 



Shell rather above medium size, discoidal, with moder- 

 ately wide, shallow umbilicus, in which is exposed nearly all 

 of each of the inner whorls. Cross-section subquadrangular 

 in outline, nearly flat dorsally and laterally, slightly concave 

 ventrally. Nodes in six rows one row on each side around 

 the umbilicus, composed of small, depressed tubercles; a sec- 

 ond series on each lateral angle of the periphery, of large pro- 

 minent nodes ; and the third, a double series around the peri- 

 phery. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures: Kansas City. 



Nautilus missouriensis SWALLOW. 

 Plate Ivi, fig. 8. 



Nautilus missouriensis Swallow, 1858: Trans. St. Louis Acad. Sci., vol. I, 

 p. 198. 



A small, smooth shell, probably an immature specimen of 

 some other species. 



Horizon and localities Upper Carboniferous, Lower Coal 

 Measures : Boone county. 



Metacoceras cavatiforme (HYATT). 



Metacoceras cavatiforme Hyatt. 1891 : Geol. Sur. Texas, 2nd Ann. Rep., p. 



334, figs. 30-33. 

 Metacoceras cavatiforme Miller, 1892 : Geol. Sur. Indiana, 18th Ann. Rep., 



p. 72, pi. xi, figs. 5 and 7. 



Shell medium size, of the N. sangamonense type, with a 

 single row of nodes on each of the peripheral border. 



Horizon and localities Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



